Witam, sprawdzice to i skomentujcie czego brakuje. Nie wiem jak gleboko sie zaglebiac w ten opis. Druga sprawa jest to ze to sklecalem z tego co znalazlem na internecie. CO prawda duzo jest na internecie, ale wszystko jedno i to samo. :)
Dzieki
The beginning:
The origins of EU07 class locomotives can be traced back to the British built EU06 locomotive. In 1959 PKP had signed a contract with Metropolitan Vickers & English Electric Company to produce a Bo'Bo' class locomotive for mixed traffic according to PKP's specifications. These included, amongst others, a max. velocity of approximately 125 km/h and continuous power of 2000kW. The EU06/EU07 locomotives were state of the art designs for their time. This was especially true from a mechanical point of view. The EU06 was based on the British 81-85 class locomotives. The close resemblance between the Polish and the British locomotives of this class is clear. In 1964 Metropolitan Vickers & English Electric Company had delivered the first EU06 class locomotive. In total there were 20 of such locomotives built and the license for further construction in Poland was signed.
The birth of EU07:
The Polish version of the British built EU06 is EU07. The company responsible for building the EU07 class locomotive at first was PaFaWag located in Wroclaw. In 1965 the first EU07 was built with the factory name 4E. The differences between the two classes were minor. One primary difference was the cabin heating. EU06 had used 3000V DC while EU07 had used 110V as a supply. In total Pafawag had delivered 240 locomotives between 1965 and 1974. This number later increased to 244 when some of EP08 class locomotives were rebuilt back to EU07 class after noticing design flaws with their boogies. The flaw can be traced back to the original British design. In 1983 production of EU07 was renewed. This time H. Cegielski in Poznan was responsible for the manufacturing. The EU07 had some more modifications done to it. The factory name of this locomotive was 303E. At first glance there are no visible changes between the two locomotives. However, a close look reveals that one of the ventilation blinds was removed. The body of the locomotive had changed to corrugated metal. Furthermore, the coupling mechanism was upgraded to accommodate a self-locking coupling system. In total these modifications increased the mass of the locomotive by 3 tones.
EU07 and its further modifications:
One major modification of EU07 class locomotives in recent years was a lowering of the electric traction motor rotational velocity. This was done by replacing the gearing from 79:18 to 76:21. Moreover, electric traction motors were replaced from EE541B to LK535, which had a higher insulation class than the previous ones. The gear ratio change meant that the locomotives were no longer capable for freight traffic and as a consequence the EU07 was renamed EP07. EP07 is a passenger class locomotive.
Sons and Daughters of EU06/EU07:
On railway tracks in Poland you can find many variations of EU06/EU07 class locomotives. They include a double-coupled locomotive ET41 used for heavy freight trains, as well as EP08 that was only produced in small numbers to accommodate fast express trains in the 70's and 80's. All of these have a very close resemblance to the original design. A very heavily modified version of EU07 is ET22, a Co'Co' freight locomotive.
